The calculated distance (air line) between Songnim-ni and P’yŏngsŏng is approximately 36 miles respectively 57 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Songnim-ni and P’yŏngsŏng has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles